Telephone coin collection system



March 23, 1954 c. 5:. LOMAX TELEPHONE com COLLECTION SYSTEM 5Sheets-Sheet 1 Filed July 29, 1950 INVENTOR. CLARENCE E. LOMAX EmDZE m2:

ATTORNEY March 23, 1954 c. E. LOMAX 2,673,243

TELEPHONE COIN COLLECTION SYSTEM Filed July 29, 1950 5 Sheets-Sheet 2 0-r0 1:) m Sm :6 :1: a E: a 3 22 2 ID (O s .2 w; "ar 9 9 2 3 z K N 3 E? U.

J o INVENTOR.

CLARENCE E. LOMAX ATTORN E Y C. E. LOMAX TELEPHONE COIN COLLECTIONSYSTEM Marqh 23, 1954 5 Sheets-Sheet 3 Filed July 29, 1950 mmmflwu U m mH m m E9 mowAU l 11 1 5; u 8 n -53 mt l n mm H u mnw hl $94.1 m .E n n uO m mi a. n u ri as I I? h m n m 08 9.: w h H vww m m n 3.: 0m n m 0% hn MM) @4 IT :vON mokowdw t wwmafl. m8 mm. It .8; u a 08 T 5N QNNF 9N m m6N H wow/L I fiN/Bl L. ow lel .T IT :N w 552E b6 .v lifill .mw wzj 4wwzj M m GE T v CLARENCE E. LOMAX ATTORNEY C. E. LOMAX TELEPHONE COINCOLLECTION SYSTEM March 23, 1954 5 Sheets-Sheet 4 Filed July 29, 1950mhm ATTORNEY March 23, 1954 c. E. LOMAX TELEPHONE com COLLECTION SYSTEM5 Sheets-Sheet 5 Filed July 29, 1950 8 I) n INVEXI TjR.

89% NNW 11 mmv mmv OVV Nml w m OE C LARENCE E. LOMAX ATTORNEY PatentedMar. 23, 1954 2,673,243 TELEPHONE COIN COLLECTION SYSTEM Clarence E.Lomax, Automatic Electric Chicago, Ill., assignor to Laboratories, Inc.,Chicago,

111., a corporation of Delaware Application July 29, 1950, Serial No.176,756 6 Claims. (01. 179-6.3)

This invention relates in general to automatic telephone systems and,more particularly, to means for controlling the coin mechanism whereinit is required that coins of a certain denomination only can initiate acall.

The main object of the present invention is the provision of a new andnovel. paystation circuit arrangement wherein a party operating the dialsubsequent to the depositing of a non-initiating denomination coin willcause that particular coin to be refunded.

It is another ,object of the invention to provide, in such an automatictelephone system, improved and simplified apparatus wherein refundpotential is automatically transmitted responsive to the answering ofthe operator only when the call originates from a paystation.

It is another object of the invention to provide improved andexceedingly simple paystation circuit apparatus wherein a more positiveindication of the success or failure of manual operation of the coinmagnets is afforded the operator.

These and other objects are accomplished according to the invention, bythe arrangement and combination of elements set forth in the followingdescription, defined in the appended claims and illustrativelyexemplified in the accompanying drawings, in which:

Fig. 1 shows an automatic substation of the paystation type, anassociated line circuit and a succeeding line finder.

Fig. 2 shows a portion of the paystation repeater associated with theline finder.

Fig. 3 shows the remainder of the paystation repeater circuit associatedlector. A regular subscriber and a switch train is illustrated in theupper right section.

Fig. 4 shows a portion of the combined line and recording trunk circuit(hereinafter referred to as CLR trunk).

Fig. 5 shows the remainder of the CLR trunk and the operators cord andcoin control circuits.

Figs. 1-5 are assembled from left to right in order.

In the preferred form of this invention the arrangement is such that adime or a quarter must be deposited before a'call may be initiated. Thecoin collect-refund mechanism shown in Fig. 1 may be of the well knowntype as illustrated in U. S. patent to George A. Long, No. 1,886,409,granted November 8, 1932, with a slight modification of the hopper. Thehopper is enlarged and so constructed that two distinct and separatechannels are provided to pass the coins to the arresting device. Thecoin races leading to the with its succeedin se- 2 hopper are alsomodified so that dimes and quarters will be guided to one channel of thehopper while nickels only will be directed to the other. The cointrigger that controls the operation of the coin springs protrudes intoone of these channelsthe one passing dimes and quarters. Therefore, onlydimes or quarters can trip the coin springs and initiate a call. Itshould be under- March 15, 1932. The line circuits indicated may also beof the type as shown in the above-mentioned patent. The neon tube shownin Fig. 1 has the well-known characteristic of being nonconductive untila predetermined voltage is impressed across the terminals thereof.Following ionization of the gas contained therein the voltage requiredto maintain the tube conductive is substantially less than that requiredfor initiating ionization. Also, the resistance of the device issubstantially lessened after the device is rendered coin magnetstripped.

It should be understood that any suitable discharge device could be usedin lieu of a neon tube. The inventor does not wish to be limited merelythereto.

The selectors indicated in Fig. 3 may be of the well known Strowger typesimilar to the selector shown in U. S. Patent No. 1,956,374, grantedApril 24, 1934.

In order to explain the operation of the circuits, it will first beassumed that a party wishes to extend a call from the automaticpaystation A to a subscriber in a distant exchange, not shown, and theparty attempts to do so by depositing a nickel in the coin collectingmechanism at the paystation. The nickel would descend through themodified coin race emerging and entering the hopper at the top ofchannel 6. The coin would then proceed unobstructed to arresting devicetil, whereupon it is retained. It will be seen from the I tonetransmitter I3 and It will now be assumed that following the depositingof said nickel the receiver is removed. A loop circuit is formed throughpaystation A, traced over the following path: line L, dial pulsingcontact I, hook-switch contact 8, induction coil winding II, talkingtransmitter I2, coin resistor M in parallel, to line +L. The line relayin the indicated line circuit will energize over this loop circuit inwellknown manner and a line finder will subsequently initiate a searchfor calling paystation line A, also in well known manner. The linefinder being of the pro-seizing type, will close a loop within itself tothe associated succeeding repeater before the calling line is actuallyfound. Once it is found the loop, of course, extends back to thepaystation. Line relay2l0 will then energize, traced over the followingpath: ground, impedance resistor 2%, lower winding of differential relay225, repeating coil winding 2E2, conductor H3, contact te l, contactI48, line +L, loop circuit hereinbefore explained, line -L, con tact14!, contact iti, conductor Ill], repeating coil winding lei, upperwinding of differential relay 22%, through line relay 2m to battery. Asis well known in the art, differential relay 22 3 will not operate whenits two windings are energized simultaneously. Line relay 2H), inclosing contact 2H2, completes a path to operate release relay tracedover the following path; ground, contact I581), conductor I'il, contact2E2, through release relay 236 to battery. Pulse repeating contact 2| 5is also closed upon operation of line relay 2Iil, but serves no usefulfunction at this point. Release relay 233 in closing contact 23! closesthe loop to pre-seize the associated succeeding selector, traced overthe following path: line -L, conductor I12, contact IE2, conductor ill,contact 2| I, contact 23!, contact 262, conductor I74, contact Hi5,conductor I15, to line -{-L. Release relay 238, in closing contact 232applies ground to the control lead C to hold the preceding switches.Release relay 23! in closing contact 233, partially completes anenergizing path for hold relay 250, circuit to be traced hereinafter. Itwill be stated at this point that the shunt field relay 240 will notoperate as the voltage impressed on each half of the relay is of suchpolarity that the resultant flux produced by the two currents will aidand confine their magnetic paths within the core of the shunt fieldrelay, producing no movement of the shunt field armature. Dial tone isnot heard by the party at substation A as the repeating coil thattransforms the tone from the selector, circuit to be traced hereinafter,will be disabled. This disablement of the repeating coil is effected bya short around windings 253 and 264 over con tact 282.

The party at substation A now dials a digit in an attempt to communicatewith a party at a distant station. Line relay 2!!! being in series withthe dial pulsing contact I, responds to the pulses. Once again the pulserepeating contact 2 I! will serve no useful function as a shunt overcontact 2% will maintain the pulse repeating circuit in a constantstate, preventing the repeating of the dialed pulses to pass on andoperate the selector; This pulse repeating circuit will subsequently bedescribed.

Thus, it can be seen that paystation A is incapable of extending a callin the present con dition, namely, subsequent to the depositing of anickel. Responsive to the first pulse of the particular digit dialed,line relay 2! in falling conductor L, line 7 2 ill, hereinbefore backand closing contact 2I3 operates hold relay 255, traced over thefollowing path: ground, contact Itiib, conductor 233, through hold relay250 to battery. Release relay 239, being of the slow-to-release typewill retain contact 233 closed during the time its energizing circuit ismomentarily opened at contact 2I2 due to pulsing. Hold relay 256, byclosing contact I places resistor 2B1 across c0ndenser 2%, reasontherefor hereinafter explained. Hold relay 250 also, by closing contact252, causes relay I to operate, traced over-the following path: ground,contact 252, contact 209, conductor I83, contact I51, through relay I39to battery. Relay I39, once operated, places ground on contacts I3! andI32 to energize relays Hi and Hit, respectively. Relay I40, in closingcontacts Hi2 and I44 prepares a path for the refunding potential. Otherfunctions of relay I will subsequently be described. Relay Illi, byclosing contact II4 completes thepath and applies refunding potentialback to the substation line, traced over the following path: negativevolt refunding potential, lamp LI, contacts I91, H4, I42, finder wiper-L, line finder bank contact -L to substation line -L. At this point,namely, during pulsing, the remaining circuit from line L, over dialoff-normal contact 9, neon tube I, through coin magnets 2 to ground willbe open at dial off-normal contact 9.. Re

fund voltage, however, will be applied after as Well as during thepulsing period as will be subsequently described.

Relay I40 also opens the circuit to line relay traced, at contacts MIand I43. Line relay 2Ill will therefore receive no more pulses, butrestoring will permit hold relay 259 to remain energized, circuit forwhich has been traced hereinbefore. Release relay 230, being of theslow-to-release type, will maintain the energizing circuit for holdrelay 250 at contact 233 and hold relay 259, also being of theslow-to-release type, will prolong its operation still further afterrelease relay 230 no longer can close contact 233. The result is thatground on contact 252 is maintained until after pulsing is completed inorder to hold relays I33, I It and I4il in their operated positions,respective energizing circuits having been hereinbefore described.Refund potential is then applied to line -L during and after the dialingof a digit. When the dial comes back to normal the refunding potentialwill be impressed across the neon tube and coin magnets in series ashereinbefore described. The negative 110 volts is sufficient to causethis neon discharge device to become ionized and conductive. Thus thecoin magnets 2 will operate and cause arresting device I0 to pass thenickel to the coin return receptacle. Relay I40, in closing contact I48,grounds the control lead C. This ground is provided so that removal ofground at contact 232, responsive to the complete deenergization ofrelay 23fi, will not release the preceding line finder. The finder willthus be held as long as refund battery is applied to conductor -L. v

As the depositing of a nickel affected nothing whatsoever, it can easilybe understood that the identical result as heretofore described wouldlikewise occur if a party at paystation A lifted the receiver andattempted to dial without depositing a. coin. Similarly, the sameoperation would have taken place had the party at paystation A hung upwithout dialing. Opening of the hook-switch contact 8, responsive toreplac- I'l9, contact 2I3, contact ing the receiver, will open the loopcircuit, as hereinbefore traced. Since the first momentary interruptionof the loop circuit, effected by the operation of dialing, ultimatelyresults in application of refunding potential to the coin magnets 2, ashereinbefore described, the permanent openhookswitch contact 8 willsimilarly do so.

It will now be assumed that upon failure to initiate a call with anickel the party at paystation A deposits a dime or a quarter. The dimeor quarter descends the appropriate coin race emerging at the opening ofchannel 5. From the coin mechanism diagram in Fig. 1 it can be seen thatcoin trigger 4 will be tripped as the dime or quarter descends channel5. The coin will be retained on arresting device I ii in well knownmanner and the tripping of coin trigger 4 will actuate coin springs 3,also in well known manner. By closing coin springs 3 line -L iseffectively grounded through coin magnets 2. The function of this groundwill be hereinafter explained. Removal of the receiver at paystation A,either before or after the depositing of the dime or quarter, will causeline relay 2H3 to operate, once the line is found, over the loop in thesame manner as previously described for the nickel depositing. However,at this time the ground on line -L at the paystation will unbalancedifferential relay 22s and cause operation of same. The upper magnets 2,coin springs 3, station line -L, line finder bank contact L, line finderwiper -L, conductor -L, contact IAI, contact I6I, conductor I'm,repeating coil winding 25L through upper winding of diffe ential relay228 and line relay 24s to battery. There is also another energizing pathfor the upper winding of differential relay 22B, traced over thefollowing path: ground, impedance resistor peating coil winding 262,conductor I15, contact I54, contact I43, conductor +L, line finder wiper+L, line finder bank contact +L, paystation line +L, coin tonetransmitter I 3 and resistor I4 in parallel, talking transmitter I2,induction coil winding II, hookswitch contact 8, dial pulsing contact I,paystation line -L, line same magnitude as that flowing in the case ofan ungrounded line L, namely, coin springs not closed. However, unlikethat case the lower winding will have ground on each side rendering itincapable of producing a flux to balance winding 263, contact 23Lincreasing the pulsing current.

upper winding of differential relay 22s is energized operation of samewill follow. Difierential relay 220, in closing contact 22I, preparesthe energizing circuit for relay 200, traced hereinafter.

Line relay lit, in closing contact 2I2, operates release relay 23E,circuit for which has been traced hereinbefore. Release relay 23d, inclosing contact 23I preseizes the associated selector, circuit for whichalso has been traced hereinbefore. Once seized, the selector will returnground back over the control C lead. This ground will cause relay 205.2to operate over the following path: ground from selector, control Clead, contact 22L through relay 260 to battery. This ground returnedfrom the selector on the control C lead will also energize the rightwinding of shunt field relay Mil. Battery and ground on conductors Land. +L, respectively, will also be returned from the line relay of theselector to energize the left winding of shunt field relay 2 35, tracedover the following path: negative battery, through top winding ofselector line relay (not shown), conductor L, conductor I72, contactI52, conductor Il'I, contact 2! I, contact 23H, repeating coil winding263, through left winding of shunt field relay 24s, repcating coilWinding 264, conductor I'M, contact 665, conductor I15, conductor +L,through bottom winding of selector line relay (not shown) to ground. Atthis point the voltages impressed on each side of shunt field relay 246will be of such polarity that the armature will not be actuated, reasontherefor explained hereinbefore. Relay 238, in opening contact 2e: andthereby removing the shunt around contacts 2 I I, renders the pulserepeating circuit capable of functioning as such, traced over thefollowing path: ground, lower winding of selector line relay, conductor+L, conductor I15, contact I85, conductor I'M, repeating coil winding25%, left winding of differential relay 240, repeating coil winding 25%,contact 23L pulse repeating contact 2! I, conductor I II, contact I62,conductor IE2, conductor -L, upper winding of selector line relay tobattery. Relay 2% also, by opening contact 262, permits dial tone to beheard by the party at paystation A. Dial tone A. C. voltage will beinductively coupled to the conductor between ground and the lowerwinding of the selector line relay. This dial tone will be impressedacross the right two windings 263 and 2634 of the repeating coil, tracedover the following path: through lower winding of selector line relay,conductor +L, conductor I 75, contact IE5, conductor I M, repeating coilwinding 254, condenser 26% and left winding of shunt field relay Z iiiin contact 25 I, conductor IlI, contact I62, conductor I72, conductor-L, through upper winding of selector line relay, through battery toground. The dial tone A. C. voltage, by transformer action, will beimpressed across the left two windings EISI and 2%?! of the repeatingcoil and transmitted back to paystation A in well knownmanner. Relay 2%also, in closing contacts res and 2M shunt the upper and lower windings,respectively, of differential relay 22d. shunting diife ential relay 229eliminates same from the dial pulsing path, circuit for which has beentraced hereinbefore, thereby shunting differmore transmitter entialrelay 22:: also provides" I2 current when free service stations aredialed,

' open the original 7 receive the busy .This is necessary since thecompletion of such calls will not cause reverse battery to be returned,which is essential for the operation of the switch through relay I69, aswill be explained hereinafter. The paystation A will therefore notextend, clear of attachments, through the repeater. For free servicecalls the talking circuit will be identical to the dial pulsing path,traced over the following path: ground, impedance resistor 2653, contact294, repeating coil winding 262, conductor I13, contact I65, contactI43, conductor +L, calling loop, conductor L, contact I il, contact I6I,conductor I'IIJ, repeating coil winding 25%, contact 293, through linerelay 2Ifi to battery.

' It can easily be seen that talking battery is supplied from the linerelay ZIB of the repeater for free calls rather than from the connectorline relay as in the case of regular calls. It can likewise be seen thatthe elimination of the differential relay and its resistance willincrease the transmitter current. Relay 2% also, by closing contact 285looks itself operated from the ground that is returned from the selectorover the control C lead. This self-locking feature is necessary sincecontacts 2% and will cause differential relay 22% to restore andenergizing circuit for relay 253i? at contact 22%. Relay'ililo also, inclosing contact 208 prepares a path for resistor 269 to shunt impedanceresistor 2%, circuit for which will be traced hereinafter. Relay 2%also, in closing contact 2%, causes relay its to operate, traced overthe following path: ground, contact 20%, conductor l82, through relayi528 to battery. Functions'of relay I56 will be discussed hereinafter.

It is now assumed that subsequent to the return of dial tone the partyat paystation A will.

dial the digit combination peculiar to the desired distant station. Itwill further be assumed at this point that the called station will bebusy. Line relay 2H2 responds to the dial pulses, circuit for which hasbeen traced hereinbefore, and by operating contact 2II which is in thepulse repeating circuit, also traced hereinbefore, the pulses will berepeated to the succeeding selector. The first pulse in causing linerelay ZIil to restore and close contact 2I3 will effect the operation ofslow-to-release hold relay 25G, circuit for which has been tracedhereinbefore. Relay 2%, in closing contact 252, causes resistor 2&9

to shunt impedance resistor 26%, traced over the following path: ground,contact 2512, contact 298, resistor 2&9 to impedance resistor 26%.Shunting of impedance resistor 269 will improve dialing and as releaserelay 23S and hold relay 25s are both of the slow-to-release type, thisimprovement will be operative during the entire dialing operation. Relay25% also, in closing contact 25! places resistor 26'! in parallel withcondenser 25%. This resistor 261 will also be maintained in the pulsingcircuit during the dialing operation and will likewise improve pulsing.The pulse will be repeated to the succeeding switch train and cause theselection of the proper station in well known manner.

aving assumed the called station to be busy, busy tone will betransmitted back to paystation A subsequent to the operation of theconnector associated with the called station. The busy tone A. C.voltage will originate at the connector and extend back over the lines,via the preceding switches, to repeating coil windings 263 and 264.Repeating coil windings 2M and 252 inductively tone voltage and insimilar 2534 in closing,

i ground, contact I22,

. traced over the following fashion as dial tone transmission the busytone will appear across the paystation 'A. The party at paystation Awill then replace the receiver and cause the opening of hookswitchcontact 8 and consequently the opening of the energizing circuit, tracedhereinbefore, to the line relay 2I0. Line relay 2 II), in openingcontact 2| I, opens the pulse repeating circuit, traced hereinbefore,causing the succeeding switch to release. Line relay ZIIl, in openingcontact 2I2, causes release relay 23 to restore. Release relay 238-,being of the slow-to-release type, may restore either before or afterthe succeeding switches release. Relay I5EI in still being energized atthis time, maintains ground at contact I53 'to contact C to'hold thepreceding line finder. V The succeeding switch train in releasing and nolonger sending ground back on control C causes relay 2m: to restore,holding circuit for which has been traced hereinbefore. Relay 2%, inrestoring and thereby closing contact 29! operates relay Hi8, tracedover the following path: ground, contact 261, conductor IBI, contactI54, through relay I to battery. Relay I43, in closing contacts I42,connects one side of relay I20 to line -L. Since the line L is groundedthrough coin magnets 2, effected by the depositing of a dime or quarteras hereinbeiore explained, relay I20 will operate, traced over thefollowing path: ground at paystation A, coin magnets 2, coin springs s,dial contact 52, line L, line finder bank contact L, line finder wiper-L, conductor L, contact I42, contact H3, through relay upon restoringopens the energizing circuit to relay 59, circuit for which has beentraced hereinbefore. However, relay I2Il in closing contact i122 rendersslow-to-release relay IEZI a different energizing circuit before samerelay I59 can fully restore, traced over the following path: contactI55, through relay 55% to battery. Relay I59 in maintaining contact I52closed, relay I40 in closing contact I45, and relay I29 in closingcontact I2! cooperate to supply interrupted ground to operate relayIIfl, path: interrupted ground, contact I52, contact I45, contact I2I,through relay I IE! to battery. Relay I Ill, being of the fast actingand release type will operate periodically in response to the pulses ofground received by it from interrupted ground. Thus, relay I II), inclosing contact I It will apply refund potential intermittently to coinmagnets 2, circuit for which has been traced hereinbefore. Relay II c,in'closing contact II2 before IE4 (said relay springs adjusted tooperate in that order),

. relay I at to battery. The original energizing circuit of relay I23 isopened at contact H3 in order that the coin magnet 2 will receive all ofthe current produced by the coin potentials. Relay IIil restores at theend of each pulse and again connects relay I29 to line -L, circuit forwhich has been traced hereinbefore. If a pulse of refund potentialproperly operated coin magnets 2 and refunds the coin, in well knownmanner, coin springs 3 will open. With the neon tube between ground andline -L, relay I253 will restore. Relay I20, in restoring and openingcontact IZI, will open the energizing circuit for relay III). Relay H8,in opening contact H4, will cause the removal of refund potentialfromline -'-L,- circuit for which has been traced herein:-

I2Il to battery. Relay before. Relay I 2Il also, in opening contact I22, to a set of contactsassociatedwith an idle CLR will causerelayISIlto restore, circuit for which trunk; has been traced hereinbefore.Relay I550, in rein the art. Assuming now that an idle position storingand opening contact I54, causes the is found, a closed line loop will beextended to restoration of relay I 40, circuit for which has 5 energizerelay 440; traced over the following been traced hereinbefore. Relay I50also, in path; ground, through lower winding of relay op nin ontact I53removes ground from the 440. repeating coil winding cs5, conductor 3',Clead and causes the release of thefinder. Howcontacts 363, 353, 343,3I3, 3G3 conductor +L, ever, i the 00111 is n p rly d p s d of wiselector bank contact +L, selector wiper +L, over Sp 3 w ll e ain closedand mainta relay repeater pulsing loop as previously described se- IZIloperated. Relay IIB will then operate i' lector wiper +L, selector bankcontact L, conp dly from int rrupted ground with the r ductor -L,contacts 3M, 3! I, 3 EM, cBI, consulting refund voltage pulsestransmitted back ductor 310, repeating coil winding 433, through to coinmagnet 2. This operation will continue upper winding of relay 440 toground. Relay 440, until the coins are dislodged and refunded. Once inclosing contact I causes relay 439 to operate, disposed of the circuitwill operate as hereinb'efore t aced over th following path: ground,contact explained. MI, through relay 430 tobattery. Relay 430, in

It is now assumed that the party at paysta i n closing contact 43I,causes relay 420 to operate, A wishes to call another distant subscriberand tracedover the following path: ground, contact nce again deposits adime or quarter. I W l 43I, contact 4, through relay 420 to battery.further be assumed that the called line will not Other functions ofrelay 439 will be hereinafter be y- AS previously explained the partycan exp ained. Relay 420 in closing contact r23 apd l f v y Subsequentto depo Of a d plies ground to the C lead over conductor 375 to or quarer. Up n answ rin of the call d par y. hold the preceding switches. Asthis is a paythe back bridge relay in the connector (not 25 stationcalling the toll operator, relay 458 will shown) associated with, thedistant called staoperate, traced over the following path: ground tion,W l Ope ate and reverse the battery to the at EC at selector, selectorwiper EC, selector bank r p t r n w l kn wn ann Thus, the po1arcontactEC, conductor 374, through relay 450 to y of the v ta e pp d to the lefthand Windbattery. Functions of relay 656 will be hereining e unt firelay 0 l b ed after explained. Relay 430, in closing contact from thathereinbefo e eXDlained, The flux now 435 and relay 450, in closingcontact 554, together produced by the current in the l f -h nd wlndcauserelay 320 to operate, traced over the fol me will opp e the fiuxproduced by the current lowing path: ground, contact 435, contact sec,in h ri ht-hand winding and the armature will contact 454, conductor378, through relay 320 to b cted to completethe two magnetic paths.battery. Relay 430 also, in closing contact 434,

Shunt field relay 240 thus operated will close conand relay 550, inclosing contact e52, together tact 2M and cause the operation of theswitch cause the call signal lamp L5 at the ack a sothreugh e y I50traced over the following path: ciated with the CLR trunk to illuminateintelground frOm Succeeding last Switch, eentaet mittently, traced overthe following path: intereenduetel' through relay I 60 to battery. 40rupted ground, contact 452, contact 434, contact Switch through relayI60, in closing contact H51, 406, through call signal lamp L5 tobattery. Relocks itself operated from ground over the C lay 420 also, inclosing contact 42I applies ring lead. switch through relay I60 inclosing conback tone back over the line to the calling paytacts I63 andIE6 switch lines -'L and -[-L direct tati h flashing n signal lamp 111through to the switch train. Switch through re- 45 dicate to theoperatorthat a paystation is delay also, in closing contact I686: causes-relayI00 sirous of completing a toll call. The operator to become energized.Functions of relay I till will new answers by inserting the plugassociated be herein f r explained. Switch through relay with a cord.The ring, tip, and sleeve of the plug Ifie also, in opening contacts I61and I64 open are connected to the ring, tip, and sleeve the energizingcircuit to line relay 2H1, circuit of the jack, respectively, and thehold confor which has been traced hereinbefore. Line sleeve of the jack,respectively, and the hold conre1ay2ie in opening H2 and closing 2I3restores ductor at the jack is grounded. Relay 4I0 will and operatesrelays 23 0 and 250, respe tively, as then operate over the followingpath: ground, hereinbefore explained. At the conclusion of the contact482, hold conductor H, through relay 4H1 conversation and subsequent tothe replacing of to battery. Relay 4| II, in closing contact 4I2, teiver by the called party, the succeeding causes relay 400 to operate.Relay 4m, in openswitches will be released. Ground no longer corningcontact 4| I, causes relay 429 to release after ing back over the C-leadwill cause switch through a delay (relay 420 is of the slow-to-releasetype). relay ice and relay 200 to restore, circuits for Relay 420 willrestore and remove ground on the which have been traced hereinbefore.The coin C lead at 423 but after relay 400 operates and apwill now bedisposed of by the same sequenceof plies another ground to C at control403. Thus, operations as previously explained, with the exthe precedingswitches will be held. Relay 460, in ception that relay I00, beingoperated, will close opening contact 40I, removesring back tone fromcontact I02 and apply +110 v. collect potential the calling paystation.Relay 480, in making instead of 110 v. refund. 5 contact 464, causesrelay 360 to operate, traced It will now b a sumed t the p ty at payoverthe following path; ground, contact 464, station A wishes to make a tollcall and, subseconductor 376, through relay 360 to battery. Re-

quent to the depositing of a dime or quarter, lay 400 also, in closingcontact 403 and opening dials the operator to do so. The selector showncontact 406 and relay 339 in closing contact ass, is of the four wipertype and will be'peculiar to together cause the interrupted ground tonow paystations only. The fourth wiper, EC, will be flash intermittentlythe ,cord disconnect larnp Ll grounded at the selector. The dial pulseswill be instead of the call signal lamp L5 traced over effective, aspreviously explained, and the wipers the following path: interruptedground, contacts of the selector will vertically step to the toll op-452, 434, 405, 424, 433, conductor S, cord plug eratons' level andtheirautoinaticallysteprotary sleeves through cord disconnect lamp Ll tobattery. This flashing will only last a short time as slow-to-operaterelease relay 420 will open the cord disconnect circuit at contact 424.However, this short period of a flashing disconnect lamp L1 will beanother reminder to the operator that she is answering a paystation.Relay 366, in clos ing contacts 362 and 364, and in opening contacts 361and 363, causes a reversal of battery from relay 446 to operate shuntfield relay 246 in the repeater. As hereinbefore explained, operation ofshunt field relay 246 will cause the lines to be switched through therepeater circuit to the CLR trunk. Relay 6%, inopening contact 406,causes the restoration of relay 326, circuit for which has been tracedhereinbefore. Relay 366, in closing contact 365, relay 326, inmaintaining contact 321 closed for a short time (relay 326 being of theslow-to-release type) and relay 450, in closing contact 45L togethercause relay 3H] to'operate, over the following path: ground, contacts45!, conductor 311, contact 365, contact 32!, through relay Slit tobattery. Relay 3m, in closing contact air, will cause 1l0 v. refundpotential to go out back over line -L to operate coin magnet 2 andrefund the dime or quarter. The repeater must be switched through beforerefund potential is applied to line L. This correct sequence ofoperations is effected by fast acting relay 366 operating before slow-to-operate relay 310. Slow-to-release relay 326 finall restores openingthe circuit to relay 3H! at contact 32 l. Thus, it will be seen that theinitial coin is refunded to the party at paystation A as soon as theoperator answers and before any conversation takes place. It will alsobe seen that relay tiiiiwill finally restore and open the circuit to thecord disconnect lamp at approximately the same time that relay 326restores and removes refund potential from line -L. This makes itpossible for the operator to use the ceasing of the flashing of thedisco'n nect lamp as the means for knowing when to speak to the party atpaystation A. If the operator should become doubtful of the type of lineafter she has started conversing she can ascertain it by temporarilyremoving the plug. Removing the plug will open the circuit to relay 416at contact 532. Relay 416 will thus restore, but, relay 466 will remainoperated over a new path: ground, contact 335, contact 461, throughrelay 636 to battery. Relay 616 in restoring and closing contact illwill cause slow-to-release relay 426 to operate, circuit for which hasbeen traced hereinbefore. Now, if the operator re-inserts the plug relay4E6 will once again operate as hereinbefore explained, and open thecircuit to relay 626, but the circuit to flash to the cord disconnectlamp, also hereinbefore explained, will be complete until relay 526finally restores and opens contact 324. Thus, the operator will see aflashing disconnect lamp once again for a short time if the party is ata paystation.

The operator can now handle the call from paystation A in the usualmanner. The operator can also collect or refund coins manually at anytime. There is a separate cord as shown in the lower right hand portionof Fig. 5, associated with each operators position. This collect-refundcord circuit has only standard switchboard talking voltage pass throughrather than the higher coin collect-refund voltages. By insertingthiscollect-refund plug into the jack associated with the CLR trunkconcerned, the operator candispose of coins by operating either therefund key or the collect key. Assuming that the operator wishes tocollect manually and pushes the 001- lay 310, in closing contact l2 lectkey to so do, relay 346 will operate, traced over the following path:ground at collect-refund cord, contact 412, contact 415, plug tip 416,conductor 413, contact 455, conductor 313, through relay 346 to battery.Relay 340, in closing contact 342 applies v. collect potential back outover the line -L to operate coin magnets 2 and collect the coins.Assuming now that the operator may wish to refund manually and pushesthe refund key to so do, relay 330 will operate, traced over thefollowing path: ground, contact 413, plug ring 411, conductor 366,contact 456, conductor 386, through relay 330 to battery. Relay 336, inclosing contact 631 will cause relay 310 to operate, traced over thefollowing path: ground, contact 15i, conductor 311, contact 365, contact335, through relay 3H) to battery. Re- 3 [2 applies refund potentialback out over the line -L to refund the coins. Relay 346, in closingcontact 345 when collecting, or relay 336, in closing contact 332 whenrefunding will cause slow-to-release relay 356 to operate, traced overthe following path: ground, contact 451, contact 345 or 332, throughrelay 356 to battery. Thus, it will be seen that relay 356 operates onlywhen coin disposal is handled by the operator and also that either amanual refund or collection will operate said relay 356. Relay 350, inclosing contacts 352 and prepares the path to relay 466. Upon the returnof either the manual collect or refund key by the operator, relay 310 or646 will restore, circuits for which have been traced hereinbefore, andalso, slow-to-release relay 356 will restore after a delay, circuit forwhich also has been traced hereinbefore. If the coin or coins have notbeen properly disposed of, coin springs 3 will not reset to a normallyopened position. Thus, for the short time relay 350 remains operatedafter relay 3H] or 340 restore, a circuit will be complete to operaterelay 460, traced over the following path: ground at paystation A,through coin magnets 2, coin springs 3, out over line L and therepeater, selector wiper L, selector bank contact -L, contacts 361, 3,34!, 352, conductor 36L conductor 46!, plug sleeve 418, through relay460 to battery. Relay 463, in closing contact 462 looks itself operatedover the following path: ground, contacts 412, 414, 462, through relay460 to battery. Relay 466 also, in closing contacts 461 illuminates lampL6. Thus, it will be seen that failure of coin refunding orcollecting-i. e. maintaining ground on line -L will cause a signal lampto so indicate. The operator could then repeat the manual operationuntil the coins are dislodged.

It will now be assumed that a party at a substation B on a regular linewishes to communicate with the operator. Upon dialing in the usualmanner the regular line will be extended to the CLR trunk and relays 45i], 466 and 426 will operate exactly as hereinbefore explained; Howeveras a regular line will access this CLR trunk from a three wiper selector(1. e. no EC), no ground will be available to operate relay 450. Thiscan be seen in Fig. 3. Thus, relay 326 will not operate. The result isthat the call signal lamp will illuminate continuously, indicating tothe operator that a regular line substation is calling. The circuit forthe callsignal lamp will now be traced over the following path: ground,contacts 453, 334, 566, through call signal lamp L5 to battery. Theoperator plugs in and causes the operation of relays'4l0, 400, and 360'in exconductor 311, contact 365,

i3 actly the same manner as hereinbefore explained. However, relay sitwill not operate and automatically causes refund potential to be ppliedto line L, as was the case in paystation service. Relay 310 is preventedfrom operating at open contact 32!. As relay I300 operates and beforerelay 420 restores, the cord disconnect the following path: ground,contacts 453, 43 i, 405, 424, 433, jack sleeve S, plug sleeve S, throughcord disconnect lamp L7 to battery. The operathe call in the usualmanner. The operator knows that no coin service is reas hereinbeforetraced, at contacts 455 and 456, respectively.

Having described my invention in detail, what I claim and desire to beprotected by an issuance of Letters Patent of the United States is:

1. In an automatic telephone system, a payposited acceptabledenominations of coins and unoperated by deposited non-acceptable denoninations of coins, a finder-repeater-selector link ated by said linerelay for transmitting switch controlling pulses from said repeater tosaid seized selector, dial tone to said repeater means for normallysupplying from said selector, a

repeating coil in said repeater, shunting means in said repeater, saidshunting means shunting said repeating coil and said pulsing contactsand maintaining said shunts only in case a coin of mission of said dialtone from pays-tation and the said switch controlling pulses from saidrepeater said repeater to transmission of to said seized selector arerespectively prevented. 3. An automatic telephone system such as claimedin claim 2, wherein said comprises tWo coin channels, one of saidchannels being for said. deposited non-acceptable coins and the other ofsaid channels being for deposited acceptable coins, and said cointrigger repeater to said seized selector respectivelv 5. An automatictelephone system such as claimed in claim 4, means, means for operatingincluding coin disposal said coin disposal means, and means operated bysaid lin relay for operating said last-mentioned means to operate 6. Anautomatic telephone system such as claimed in claim 5, including meansoperated upon completion of a call, and subsequent to said CLARENCE E.LOMAX.

References Cited in the file of this patent UNITED STATES PATENTS NumberName Date Williams Oct. 10, 1916 Quass July 30, 1929 Paine May 24, 1932Griflins Aug. 29, 1933 Lomax July 8, 1941 Davidson Feb, 3, 1942 EdwardsMar. 27, 1945 Anderson May 24, 1949 Carson et a1. May 30, 1950 coinhopper

